Johnford ST-70CH
Image: johnford.com.tw, Johnford
Key Specifications
Max Spindle
Rapid Traverse
Spindle Power
swing over bed
swing over cross slide
chuck size
How much does the Johnford ST-70CH cost?
Price estimate
We do not have a price for the Johnford ST-70CH that we can stand behind, so we show no number. Configuration, options and installation move the final price a long way: a quote is the reliable figure.
Overview
The Johnford ST-70CH is the largest of the short H-frame lathes: an A2-15 spindle, 1,600 mm (63 in) of Z travel and a weight of 13,350 kg (29,370 lb).
For work of this spindle size and length Johnford has a second candidate. The ST-70CX swings 1,020 mm (40.2 in) over the bed and 800 mm (31.5 in) over the cross slide and has 420 mm (16.5 in) of X travel, but its rapids are 12 m/min on X and 16 m/min on Z. The ST-70CH swings 920 mm (36.2 in) and 700 mm (27.6 in), travels 370 mm (14.6 in) on X, and moves at 15 m/min and 18 m/min. The difference in weight is small: the ST-70CX is listed at 13,450 kg (29,590 lb).
So the H frame is the one to take unless the part needs the extra clearance over the cross slide.
The C spindle has a 152 mm (6 in) bore, 139 mm (5.5 in) of bar capacity and 30 / 37 kW (40.2 / 49.6 hp), with 1,500 rpm from the belt-type gearbox. The tailstock travels 1,300 mm (51.2 in); its quill is Ø125 mm (4.9 in) with an MT#5 taper, which is the limit to keep in mind for heavy parts.
Full Specifications
| Parameter | Value |
|---|---|
| Swing Over Bed | 920 mm (36.2 in) |
| Swing Over Cross Slide | 700 mm (27.6 in) |
| Chuck Size | 510 mm (20.1 in) |
| Chuck Size Optional | 610 mm (24 in) |
| Bar Capacity | 139 mm (5.5 in) |
| Spindle Nose | A2-15 |
| Spindle Bore | 152 mm (6 in) |
| Spindle Transmission | Auto 4 speeds |
| Max Spindle Speed | 1,500 rpm (Std.); 1,400 rpm (Opt.) |
| Spindle Speed Geared Headstock | 1,200 rpm |
| Spindle Motor Power | 30 / 37 kW (40.2 / 49.6 hp) (Std.); 37 / 45 kW (49.6 / 60.3 hp) (Opt.) |
| Spindle Bearing Diameter | 200 mm (7.9 in) |
| Turret Stations | 12 |
| X Axis Travel | 370 mm (14.6 in) |
| Y Axis Travel Optional | ±75 mm (±3 in) |
| Z Axis Travel | 1,600 mm (63 in) |
| Rapid Traverse Rate | X: 15 m/min (591 ipm); Y: 10 m/min (394 ipm); Z: 18 m/min (709 ipm) |
| Tailstock Travel | 1,300 mm (51.2 in) |
| Tailstock Quill Travel | 125 mm (4.9 in) |
| Tailstock Quill Diameter | Ø125 mm (Ø4.9 in) |
| Tailstock Taper | MT#5 |
| Servo Motor X | 7 kW |
| Servo Motor Y Optional | 3 kW |
| Servo Motor Z | 7 kW |
| Bed Inclination | 60° |
| Machine Weight | 13,350 kg (29,370 lb) |
| Machine Dimensions | 6,482 x 2,290 x 2,765 mm (255.2 x 90.2 x 108.9 in) |
Specifications sourced from johnford.com.tw — verified 2026-10-04
Strengths & Limitations
Strengths
- 1,600 mm (63 in) of Z travel with a 510 mm (20.1 in) chuck
- Faster rapids than the ST-70CX: 15 m/min on X and 18 m/min on Z
- 700 mm (27.6 in) swing over the cross slide
- 30 / 37 kW (40.2 / 49.6 hp), optionally 37 / 45 kW (49.6 / 60.3 hp)
- Tailstock travel of 1,300 mm (51.2 in)
Limitations
- Ø125 mm (4.9 in) MT#5 tailstock quill for parts of this size
- Less swing than the ST-70CX
- Speed limited to 1,500 rpm
- 6,482 mm (255.2 in) of machine length
Best For
Frequently Asked Questions
01
The ST-70CX swings 800 mm (31.5 in) over the cross slide with 420 mm (16.5 in) of X travel and rapids of 12 m/min and 16 m/min. The ST-70CH swings 700 mm (27.6 in) with 370 mm (14.6 in) of X and rapids of 15 m/min and 18 m/min.
02
13,350 kg (29,370 lb). The plain ST-70C weighs 13,250 kg (29,150 lb) and the ST-70CX 13,450 kg (29,590 lb), so the three frames are close in weight.
03
In length, the ST-80C with 2,000 mm (78.7 in) of Z travel. The ST-80C has the same 920 mm (36.2 in) swing over the bed, a Ø200 mm (7.9 in) MT#7 tailstock quill and rapids of 10 m/min and 12 m/min, and weighs 15,300 kg (33,660 lb).
04
1,500 rpm as standard and 1,400 rpm as an option with the belt type gear box; 1,200 rpm with the geared headstock. Four automatic speeds are used in each case.
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